Bug in Match First String

[Nitrof]

I'm trying to use the Match First String in the String tool palette. It doesn't work as described in the documentation.

Anyone know why?

Nitrof

[Nitrof]

Correction to default value

[JeanPierre]

It works the other way you figure:
Enter test2:zip as string and [test1:, test2:, test3:] as array and it will output index 1 and "zip".